Winding crepe thread



lA. J. DIJKSMAN I'AL FINDING CREPE THREAD med Nov.' 1a, 194s May 23,1950

Patented May 23, 1950 WINDING CREPE THREAD Albert Johannes Dijksman,Bennekom, Derk Jan Everhard Nijkamp, Enschede, and Otto Anton HubertWaters, Arnhem, Netherlands, assignors to American Enka Corporation,Enka, N. C., a corporation ot Delaware Application November 18, 1946,Serial No. 710,702 In the Netherlands March 28, 1946 This inventionrelates to the preparation of warp and is more particularly concernedwith the high speed preparation of warp from high twist crepe threads. I

In warping operations it is customary to support a large number ofspools of thread on a creel and to draw the thread overhead from thesespools to a beam on which the threads are wound in parallelrelationship. During the passage of the threads from the spools to thebeam, their path of travel and tension is very accurately controlled bythe use of brakes, guides, reeds and the like so that the warp producedwill be of high quality and so that the creeling speed may be maintainedas high as several hundred meters per minute.

Conventional warping arrangements, as described above, are veryeflicient in most instances but have been found to be highlyunsatisfactory in the warping of crepe due to the fact that crepethread, if taken oif a stationary spool in an overhead manner, tends toform loops and wrinkles that cannot be corrected by conventionalcreeling brakes. and that are often aggravated thereby. In some casesloops and wrinkles are actually formed by the brakes themselves becausea twist is pushed up by the brake.

In an effort to overcome the foregoing problem, it has been proposed tocombine a brake with a thread guide so that wrinkles that are formedincident to overhead draw ofi can be removed before the thread reachesthe beam. However, owing to the relatively large distance between thewound bobbin of the thread guidev and brake assembly, there is atendency. when the beam is stopped for any reason, for the threads tocontact with threads from neighboring bobbins being led to the beam,causing entanglements and other diiliculties.

In view of the foregoing, sometimes the warping of crepe threads hasbeen effected by employing rotatably mounted flanged spools forsupporting the thread on the creel, the spool being unwound tangentiallyrather than overhead. This arrangement is satisfactory so far as theelimination of loops and twists is concerned but cannot be used on thenormal creels and is very inefficient as to time consumed in eilectingthe warping operation, the loss of time resulting from the frictionaldrag of the rotatable spools which requires a low draw off speed toprevent thread breakage. It has been found that to avoid breakage it isfrequently necessary to reduce the draw ofi speed to some thirty metersper minute.

It istherefore an object of this invention to provide warping apparatusthat is capable of handling crepe threads drawn from stationary,non-rotating bobbins at very high draw off speeds while whollyeliminating the formation of the objectionable loops and twists thatcharacterized the previous efforts of the art in this direction.

It is also an object of this invention to provide a method for the highspeed warping of crepe threads that is characterized by the preventionof entanglements and thread breakage coupled with the maintenance ofthread quality at a high value.

Other Vobjects and advantages of this inventionwill be apparent uponconsideration of the following detailed description of severalembodiments thereof in conjunction with the annexed drawings. wherein:

Figure l is a schematic view in side elevation of a running point of acreel incorporating the apparatus of the present invention andillustrating the processes of the present invention;

Figure 2 is a view similar to Figure 1 illustrating a modified type ofapparatus;

Figure 3 is a view also similar to Figure 1 but illustrating a furthermodified type of apparatus;

Figure 4 is a view in front elevation of the apparatus of Figure 3; and

Figures 5 and 6 are views in elevation to an enlarged scale for thepurpose of demonstrating the direction of twist of crepe threads, Figure5 illustrating a Z-twist and Figure 6 an S-twist.

Referring now to the drawings in greater detail, the reference numerall0 refers to asta- 0 tionary, non-rotating wound body of twisted rayonthread such as crepe. The body I0 is shownvdiagrammatically but isintended to indicate bobbins, conical packages and other forms of woundtwisted rayon thread of circular crosssection. The numeral Il representsa warping beam at a point remote from the running point at which thethread body I0 is located. The thread body I0 is supported in astationary, nonrotating manner on a creel spindle I2 diagrammaticallyindicated in Figures 1, 2 and 3. When the beam ll is rotated at aperipheral speed of several hundred meters a minute, thread is drawnoverhead from the body I0 and is wound on the beam. It will beunderstood that While but a single running point is illustrated in theFigures l, 2 and 3 of the drawings, a large number of such points arecontemplated as is customary in the construction of creels.

Referring now particularly to Figure 1, the numeral I3 represents athread guide that is prevent entanglement with the thread guide.

tions as a thread guide.

\ which is inserted in the form of a sleeve.

spaced from the end of the wound body III a.

distance less than the radius of the wound body in its fully'wound form.The numeral Il represents a brake combined therewith. This arrangementalone is benecial in preventing tangles and the like but it has benfound, as a part of this invention, that superior results are attainedif the thread is taken of! overhead in such manner that the twistimparted thereto during the ballooning incident to unwinding is in thesame direction and additive to the original twist of the componentthread of the package I0.

In the preparation of crepe thread the high twist to which the initiallyparallel laments are subjected, may be in either of two directions. Inone direction the twist is called a Z-twist and in the other it iscalled an S-twist. These twists are illustrated in Figures 5 and 6. Whenthe yarn has been wound on a cylindrical bobbin it can be withdrawnoverhead from either direction. Thus, in the warping of crepe threadsthat have been wound on cylindrical bobbins, it

is only necessary to place the bobbin on the creel support in such a waythat when the 'thread is withdrawn it will balloon in such a way thatthe balloon twist will be additive to the twist to which the thread hasalready been subjected. When conical bobbins are used, however, they canonly be unwound in an overhead manner from the small end and, in suchcases, it is necessary to prewind the bobbin in such a way that duringthe unwinding oi of the small end, the ballooning twist will correspondto the twine of the thread. In the threading-up of a creel, it must beborne in mind that commercial crepe warp consists of alternate threadsof Z- and S- twists. Accordingly, if cylindrical bobbins are used,bobbins supplying parallel adjacent threads must be oppositely disposedon the spindles of the creel, and in the case of conical bobbinsadjacent bobbins must be oppositely wound.

While the apparatus of Figure 1 is effective above. The additive twist,however, tends to form a balloon which has a great tendency tol moveforward in the direction of the arrow in` Figure 1. If the thread guidesused were nothing more than a small eye, as indicated at I3 in Figure 1,there is some tendency for the balloon to become clamped across thethread guide.

as disc I6 shown in Figure 2, said disc being associated with a threadguide such as I1. The

disc I6 may have a at or conical shape and tends to baille the balloonin such a way as to In lieu of a disc such as I6 combined with a threadguide such as Il, a unitary structure such as IB may be used. Thisstructure consists of a disc having a central orice at I9 which func- Ifdesired, the opening at I9 may be dened by some special material Thediscs I8 are so chosen with respect to diameter ,Y that when the creelframe is filled, adjacent discs I8 almost touch one another. In thisregard becoming entangled on the left side of the disc,

This can be avoided by the use of a disc such as it is viewed in Figure3. With the installation described in Figure 3, it Is possible todispose the thread brake I4 at some distance from the thread guide atI8.

It has been stated that the thread guide must be disposed close to thebobbin or package which is being unwound, the distance between the endof the bobbin adjacent the guide, and the guide being less than theradius of the fully wound bobbin at that end. In actual measurement thmdistance is ordinarily two centimeters or less. For convenience inoperation the thread guides and/or discs may be arranged for slidingmovement toward and from the end of the bobbin.

While several forms of the invention have been described, it will beunderstood that the illustrated forms of the invention are merelyillustrative and that modiications are contemplated within the scope ofthe invention as defined by the following claims.

What is claimed is:

1. In the warping of high twist rayon such as crepe, the improvementthat comprises supporting in a stationary, non-rotating unwindingposition, a wound body of twisted rayon thread of circular crosssection, drawing oif thread from an end of said wound body whileaugmenting the existing twist of the component thread thereof, andguiding succeeding portions of the unwound thread at a point spacedaxially from the draw-off end of the wound body a distance that is lessthan the radius of the fully wound body at its draw-off end.

2. In the warping of high twist rayon such as crepe, the improvementthat comprises supporting in a stationary, non-rotating unwindingposition, a wound body of twisted rayon thread of circular crosssection, drawing oil thread from an end of said wound body whileaugmenting the existing twist of the component thread thereoi, andpassing succeeding portions of the unwound thread through a smallcircular guiding zone located at a point spaced axially from thedraw-oil end of the wound body a distance that is less than the radiusof the fully wound body at its draw-off end.

3. In the warping of high twist rayon such as crepe, the improvementthat comprises supporting in a stationary, non-rotating unwindingposition, a wound body of twisted rayon thread of circular crosssection, drawing off thread from an end of 'said wound body whileaugmenting the existing twist of the component thread thereof, andguiding succeeding portions of the unwound thread at a point spacedaxially from the draw-off end of the wound body at a distance that isless than the .radius of the fully wound body at its draw-oil end, andconning the axial extension of the ballooning thread to a distance fromthe unwinding end of the wound body not greater than the distance ofsaid guiding point therefrom.

4. In apparatus for the warping of rayon threads which includes meansforsupporting in a stationary, non-rotating unwinding position, a woundbody of rayon thread of circular crosssection, and draw-oil device fordrawing thread axially from one end of a wound body supported on saidmeans, the improvement that comprises thread guiding means disposed inthe thread path between the wound body and said draw-off device adistance from the draw-oil end of the wound body that is less than theradius of the fully found body at its draw-off end whereby high speteiwarping ci' high twist thread may `be e!- !ec d.

5. In apparatus for the warping of rayon threads which includes meansfor supporting in a stationary, non-rotating unwinding position, a woundbody of rayon thread of circular crosssection, and draw-off device fordrawing thread axially from one end of a wound body supported on saidmeans, the improvement that comprises /a-disrrhaving a central threadguiding aperture,

said disc being" disposed in a plane normal to the thread path betweensaid Wound body and said draw-off device a distance from the draw-oil'end oi' the wound body that is less than the radius of the fully woundbody at its draw-olf end whereby high speed lwarping of high twistthread may be eifected.

6. 4 In apparatus for the warping of rayon threads which includes meansfor supporting in a stationary non-rotating unwinding position, a woundbody of rayon thread of circular crosssection, and draw-off device fordrawing thread axially from one end of a wound body supported on saidmeans, the imp-ovement that comprises thread guiding means disposed inthe thread path between the wound body and said draw-off device adistance from the raw-01T end oi' the wound body that is less than theradius of the fully wound body at its draw-off end, and disc meanssurrounding said guiding means whereby high speed warping of high twistthread may be efi'ected.

7. In apparatus for the warping of rayon thread which includes aplurality of closely spaced means, each for supporting in a stationary,nonrotating unwinding position a wound body of v rayon thread ofcircular cross-section, and a common draw-ofi device for drawing threadaxially from the same end of each wound body supported on said means,the improvement that comprises a plurality of disks each having asubstantially central thread-guiding aperture therein, each of saiddisks lying in the thread path between each of said wound bodies andsaid draw-oil device a distance from the draw-off end of each Wound bodywhich is less than the radius of the respective fully wound body at itsdraw-off end. the

diameter of said disks being almost equal to the distance betweenadjacent supporting means.

ALBERT JOHANNES DIJKSMAN. DERK JAN EVERHARD NIJ KAMP. OTTO ANTON HUBERTWATERS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

